Muscles

A mitochondria's role in muscle contraction is the production of...

• Synthesis of ATP
• Metabolism of ATP
• Synthesis of Proteins
• Metabolism of Worn out Proteins

Tags

NGSS.HS-LS1-7

Which is more true to cause muscle contraction?

• Actin Pulls on the myosin
• Myosin Pulls on the Titin
• Myosin Pulls on Actin
• Actin Pulls on Titin

Which ion, when present, changes the conformation of tropomyosin?

• Calcium
• Sodium
• Potassium
• Lithium

During muscle contraction the 'Z' Lines will...

• Disappear
• Get Farther apart
• Get Closer Together
• Appear Thicker

myosin protein

• sarcolemma
• sarcoplasmic reticulum
• thick filament
• thin filament

actin, contractile protein

• sarcolemma
• sarcoplasmic reticulum
• thick filament
• thin filament

What does calcium do to the actin?

• Covers myosin binding sites

• Uncovers myosin binding sites

• Covers actin binding sites

• Uncovers actin binding sites

The contracting unit of a muscle is the _______________.

• sarcomere

• myofibril

• muscle fiber

• muscle cell

Muscle cells become shorter and thicker when they contract the muscle under constant tension

• is an isotonic contraction

• is an isometric contraction

The _______________ covers bundles of cells (fascicles) within the muscle.

• endomysium

• perimysium

• sarcoplasm

• tendon